Jacobi and Hankel Multipliers of Type (p,q},1<p<q<oo. Georg Gasper, Walter Trebels (1978) Mathematische Annalen
Jensen inequalities for functions with higher monotonicities. A.M. Fink, M., Jr. Jodeit (1990) Aequationes mathematicae
Jensen's inequality for conditional expectations. Hansen, Frank (2005) JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]